Kohler CH750S Specifications
| Engine Model: Kohler Command CH750S |
| Engine Type: 4-cycle V-Twin cylinder horizontal shaft air-cooled gasoline |
| Total Displacement: 46 cu.in (747 cc) |
| Rated Engine Power: 27 Hp (20.1 kW) at 3600 rpm |
| Carburetor Type: Two-barrel with fixed main jet |
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Engine Model .............. Kohler Command CH750S
Engine Type .............. 4-cycle V-Twin cylinder horizontal shaft air-cooled gasoline engine
Number of Cylinders .............. 2
Displacement, cc (cu.in) .............. 747 (46.0)
Engine Bore, mm (in) .............. 83.0 (3.27)
Engine Stroke, mm (in) .............. 69.0 (2.70)
Rated Engine Power, hp (kW) .............. 27.0 (20.1)
Rated Engine Speed, rpm .............. 3600
Maximum Torque, Nm (ft-lb) .............. 55.9 (41.2)
Torque Speed, rpm .............. 3200
Compression Ratio .............. 9.4:1
Lubrication System .............. Full pressure
Oil Filter Type .............. Full-flow
Air Cleaner Type .............. Replaceable, paper element
Ignition System .............. Electronic magneto
Starting System .............. Electric starter
Electrical System Rating, Volts .............. 12
Fuel System Type .............. Carburetor
Carburetor Model .............. Keihin
Carburetor Type .............. Two-Barrel, fixed main jet
Fuel Pump Type .............. Pulse, mechanical
Fuel Filter Type .............. In-line
Governor .............. Mechanical
Length, mm (in) .............. 355 (14.0)
Width, mm (in) .............. 450 (17.7)
Height, mm (in) .............. 567 (22.4)
Net weight, kg (lbs) .............. 43.0 (94.0)
Cylinder Bore Inside Diameter (Std), mm (in) .............. 82.988-83.013 (3.2672-3.2682)
Cylinder Bore Inside Diameter (Max), mm (in) .............. 83.051 (3.2697)
Cylinder Bore (Max Out of Round), mm (in) .............. 0.12 (0.0047)
Crankshaft End Play, mm (in) .............. 0.070-0.590 (0.0028-0.0230)
Crankshaft Bore (Crankcase), mm (in) .............. 40.965-41.003 (1.6128-1.6143)
Crankshaft Bore (Closure Plate), mm (in) .............. 40.987-40.974 (1.6136-1.6131)
Crankshaft Bore to Crankshaft Clearance, mm (in) .............. 0.039-0.074 (0.0015-0.0029)
Connecting Rod Journal Outside Diameter, mm (in) .............. 35.955-35.973 (1.4156-1.4163)
Connecting Rod to Crankpin Clearance, mm (in) .............. 0.030-0.055 (0.0012-0.0022)
Connecting Rod to Crankpin Side Clearance, mm (in) .............. 0.26-0.63 (0.0102-0.0248)
Connecting Rod to Piston Pin Clearance, mm (in) .............. 0.015-0.028 (0.0006-0.0011)
Camshaft End Play, mm (in) .............. 0.076-0.127 (0.0030-0.0050)
Camshaft Clearance, mm (in) .............. 0.025-0.063 (0.0010-0.0025)
Camshaft Bore Inside Diameter, mm (in) .............. 20.000-20.025 (0.7874-0.7884)
Camshaft Bearing Outside Diameter, mm (in) .............. 19.962-19.975 (0.7859-0.7864)
Cylinder Head (Max Out of Flatness), mm (in) .............. 0.076 (0.003)
Hydraulic Valve Lifter to Crankcase Clearance, mm (in) .............. 0.0241-0.0501 (0.0009-0.0020)
Valve Stem to Valve Guide Clearance (Intake), mm (in) .............. 0.038-0.076 (0.0015-0.0030)
Valve Stem to Valve Guide Clearance (Exhaust), mm (in) .............. 0.050-0.088 (0.0020-0.0035)
Valve Guide Inside Diameter, mm (in) .............. 7.038-7.058 (0.2771-0.2779)
Valve Minimum Lift (Intake), mm (in) .............. 8.07 (0.3177)
Valve Minimum Lift (Exhaust), mm (in) .............. 8.07 (0.3177)
Valve Face Angle, degrees .............. 45
Valve Seat Angle, degrees .............. 89
Intake Valve Guide Depth (Intake), mm (in) .............. 4.00 (0.1575)
Exhaust Valve Guide Depth (Exhaust), mm (in) .............. 6.50 (0.2559)
Valve Insert Outside Diameter (Intake), mm (in) .............. 36.987-37.013 (1.4562-1.4572)
Valve Insert Outside Diameter (Exhaust), mm (in) .............. 32.987-33.013 (1.2987-1.2997)
Valve Head Diameter (Intake), mm (in) .............. 33.37-33.63 (1.3138-1.3240)
Valve Head Diameter (Exhaust), mm (in) .............. 29.37-29.63 (1.1563-1.1665)
Valve Stem Diameter (Intake), mm (in) .............. 6.982-7.000 (0.2749-0.2756)
Valve Stem Diameter (Exhaust), mm (in) .............. 6.970-6.988 (0.2744-0.2751)
Piston Outside Diameter (Std), mm (in) .............. 82.986 (3.2671)
Piston Outside Diameter (Wear Limit), mm (in) .............. 82.841 (3.2614)
Piston to Cylinder Bore Clearance, mm (in) .............. 0.001-0.045 (0.039-0.0018)
Piston to Piston Pin Clearance, mm (in) .............. 0.006-0.017 (0.0002-0.0007)
Piston Pin Bore Inside Diameter, mm (in) .............. 17.006-17.012 (0.6695-0.6698)
Piston Pin Outside Diameter, mm (in) .............. 16.995-17.000 (0.6691-0.6693)
Top Ring Groove Clearance, mm (in) .............. 0.025-0.048 (0.0010-0.0019)
Second Ring Groove Clearance, mm (in) .............. 0.015-0.037 (0.0006-0.0015)
Oil Ring Groove Clearance, mm (in) .............. 0.026-0.176 (0.0010-0.0070)
Top Ring End Gap, mm (in) .............. 0.25-0.56 (0.0100-0.0224)
Second Ring End Gap, mm (in) .............. 0.25-0.56 (0.0100-0.0224)
Engine Oil Type (Summer Time) .............. SAE 10W-30
Engine Oil Type (Winter Time) .............. SAE 5W-30
Oil Classification (API) .............. SJ or higher
Oil Capacity (w/o Filter), L (qts) .............. 1.6 (1.7)
Oil Capacity (with New Filter), L (qts) .............. 1.8 (1.9)
Spark Plug Type .............. Champion RC12YC
Spark Plug Gap, mm (in) .............. 0.76 (0.030)
Module Air Gap, mm (in) .............. 0.28-0.33 (0.011-0.013)
Oil Filter Part Number .............. 52 050 02-S or 12 050 01-S
Fuel Filter Part Number .............. 24 050 13-S
Air Filter Element Part Number (Std) .............. 24 083 03-S
Air Filter Pre-Cleaner Part Number (Std) .............. 24 083 05-S
Primary Air Filter Part Number (HD) .............. 25 083 01-S
Secondary Air Filter Part Number (HD) .............. 25 083 04-S
Main Fuel .............. 2-1/2 turns
Idle Fuel .............. 3/4 to 1 full turn
Low Idle Speed, rpm .............. 1200±75
High Idle Speed, rpm .............. 3600±50
Service Air Pre-Cleaner (Std) .............. Every 25 hours
Replace Air Cleaner Element (Std) .............. Every 100 hours
Change Engine Oil .............. Every 100 hours
Clean Cooling Areas .............. Every 100 hours
Change Oil Filter .............. Every 200 hours
Check Spark Plug Gap .............. Every 200 hours
Replace Fuel Filter .............. Every 200 hours
Replace Primary Air Cleaner Element (HD) .............. Every 250 hours
Check Secondary Air Cleaner Element (HD) .............. Every 250 hours
Check Carburetor Adjustment .............. Every 300 hours
Check and Adjust Valve Clearance .............. Every 300 hours
Replace Spark Plug .............. Every 500 hours
Replace Secondary Air Cleaner Element (HD) .............. Every 500 hours
Cylinder Head Nut, Nm (ft-lb) .............. 16.9-33.9 (12.5-25.1)
Cylinder Head Bolt, Nm (ft-lb) .............. 22.6-41.8 (16.7-30.8)
Rocker Arm Screw, Nm (ft-lb) .............. 11.3 (8.3)
Connecting Rod Cap, Nm (ft-lb) .............. 11.3 (8.3)
Flywheel Retaining Screw, Nm (ft-lb) .............. 66.4 (49.1)
Intake Manifold Mounting, Nm (ft-lb) .............. 7.4 (5.5)
Carburetor Mounting Nut, Nm (ft-lb) .............. 6.2-7.3 (4.6-5.4)
Closure Plate, Nm (ft-lb) .............. 24.4 (18.1)
Oil Drain Plug, Nm (ft-lb) .............. 13.6 (10.1)
Governor Lever Nut, Nm (ft-lb) .............. 6.8 (5.1)
Ignition Module, Nm (ft-lb) .............. 4.0-6.2 (2.9-4.6)
Muffler Retaining Nut, Nm (ft-lb) .............. 24.4 (18.1)
Fuel Pump Screw, Nm (ft-lb) .............. 2.3 (1.7)
Spark Plug, Nm (ft-lb) .............. 27 (20.1)
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